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drawings black and white drawings telescope drawings engraving drawings eyesight drawings england drawings swamp drawings technology drawings scaffolding drawings sir frederick william herschel drawings large drawings vertical drawings space and astronomy drawings archival drawings laboratory equipment drawings illustration drawings

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William Herschel's reflecting telescope of 40 ft (12 m) focal length, 1789 (1807). Built by the German-born English astronomer, William Herschel (1738-1822), in the grounds of his home in Slough, Berkshire, this instrument was the largest in the world, with a 4 ft (1.2 m) mirror. Herschel made observations with this telescope, including the discovery of two new moons of Saturn on the first night he used it, but made more use of a smaller 18 inch/46 cm instrument. From The Edinburgh Encyclopaedia. (Edinburgh, 1807-1829). (Photo by Oxford Science Archive/Print Collector/Getty Images)

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